From fad0cf7f1c4bcfd297d3097959dec6802d25afc1 Mon Sep 17 00:00:00 2001
From: Niels de Vos <ndevos@redhat.com>
Date: Tue, 30 Jun 2020 08:43:24 +0200
Subject: [PATCH] cephfs: add Unwrap() to error types

See-also: https://github.com/golang/go/wiki/ErrorValueFAQ#i-have-a-type-that-implements-error-and-holds-a-nested-error-how-should-i-adapt-it-to-the-new-features
Signed-off-by: Niels de Vos <ndevos@redhat.com>
---
 internal/cephfs/errors.go | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/internal/cephfs/errors.go b/internal/cephfs/errors.go
index 4ae376e53..7cacf72a8 100644
--- a/internal/cephfs/errors.go
+++ b/internal/cephfs/errors.go
@@ -27,6 +27,11 @@ func (e ErrInvalidVolID) Error() string {
 	return e.err.Error()
 }
 
+// Unwrap returns the encapsulated error of ErrInvalidVolID.
+func (e ErrInvalidVolID) Unwrap() error {
+	return e.err
+}
+
 // ErrNonStaticVolume is returned when a volume is detected as not being
 // statically provisioned
 type ErrNonStaticVolume struct {
@@ -38,6 +43,11 @@ func (e ErrNonStaticVolume) Error() string {
 	return e.err.Error()
 }
 
+// Unwrap returns the encapsulated error of ErrNonStaticVolume.
+func (e ErrNonStaticVolume) Unwrap() error {
+	return e.err
+}
+
 // ErrVolumeNotFound is returned when a subvolume is not found in CephFS
 type ErrVolumeNotFound struct {
 	err error
@@ -47,3 +57,8 @@ type ErrVolumeNotFound struct {
 func (e ErrVolumeNotFound) Error() string {
 	return e.err.Error()
 }
+
+// Unwrap returns the encapsulated error of ErrVolumeNotFound.
+func (e ErrVolumeNotFound) Unwrap() error {
+	return e.err
+}